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rice paddies Articles

Rice is one of the nomal grain in our daily. The increasing demannd for rice has greatly improved business that related to rice. Rice milling is a most important process for rice and paddy. With the highly development of economy, rice milling equipment has play a key role in rice business,especially for ...

Natural arsenic pollution of drinking water has been reported from over 70 countries world-wide, affecting an estimated 150 million people (Ravenscroft et. al., 2008). About 50 million of these people live in Bangladesh, 30 million in India and 33 million in six other countries of south and south-east Asia. It has recently been recognised that arsenic-contaminated groundwater used for irrigation ...

Paddy soil and rice (Oryza sativa L.) in the Wanshan mining area in Guizhou province have been contaminated by toxic trace metals such as cadmium (Cd) and mercury (Hg). This study examined correlations between the types and physico‐chemical parameters of the soil and the contents of trace metals and the different forms of Hg in rice. The study also carried out an assessment of the health risks ...

A rice transplanter is a specialized transplanter widely used to plant rice seedlings in the paddy field. The machine can both improve the efficiency and quality of rice transplanting. However some questions are claimed by the clients when using the paddy transplanter and we ...

Rice is commonly cultivated in Southern Europe in large river basins where the extensive use of herbicides may impactwater quality at basin scale level. Consequently, pesticide risk assessmentwould be more relevant when considering a rice cultivation area as awhole. Accordingly, two watershed-scale scenarios were developed to represent the specific agronomic, water and pesticide management ...

Increasing NH4+ adsorption can be an effective alternative in building an available N pool in soils to optimize crop recovery and minimize losses into the environment. We hypothesized that long-term fertilization may change NH4+ adsorption due to changes in the chemical and mineralogical properties of a rice (Oryza sativa L.) paddy soil. The objectives of this study were (i) to determine clay ...

The dual isotope approach using the stable isotope ratios of nitrate nitrogen (δ15NNO3) and oxygen (δ18ONO3) is a strong tool for identifying the history of nitrate in various environments. Basically, a rapid procedure for determining δ15NNO3 and δ18ONO3 values is required to analyze many more samples quickly and thus save ...

Most rice (Oryza sativa L.) simulation models assume that only temperature affects leaf appearance rate (LAR). This assumption ignores results from controlled environment studies that show that LAR in rice is not constant with time (calendar days) under constant temperature. The Streck model, which takes into account age effects on LAR, improved the prediction of leaf appearance in winter wheat ...

India produces 200 million tonnes of paddy. One tonne paddy gives 700 kg of rice and 300 kg of rice husk. Rice husk has heating value (calorific value) of 3000 kcal per kg. So it is excellent fuel. So we can burn rice husk and produce steam and generate power from it. For villages 10 KW power plant based on steam engine is quite appropriate which can process 4000 kg. of paddy into unpolished rice ...

Implications The NAFTA agreement series begins our focus on commodities, with a look at rice. In 2016, one in every eight rows of rice planted in the United States made its way to our NAFTA partners. But recent moves by the governments of the United States, Mexico and Canada could lead to a change in the important Mexican and Canadian markets. The Growth ...

In planting rice, a significant amount of irrigation water is required to prepare the farmlands and do transplanting and this is directly related to the number of machines and workers available; that is, the more the length of plowing and transplanting process due to the lack of required machinery and labor, the more the water volume consumed. Therefore, in such conditions, it is important to ...

The objective of a rice milling system is to remove the husk and the bran layers from paddy rice to produce whole white rice kernels that are sufficiently milled, free of impurities and contain a minimum number of broken kernels. The milling yield and quality of rice is dependent on the quality of the paddy, the milling equipment used and the skill of the mill operator. With the rapid ...

Start the engine in the following orders: check whether there is full of oil in the engine; open the oil circuit and then open the throttle; check the whether the clutch is separate and the gear shift level is in the neutral position; start the engine. Before planting the rice seedlings, a test should be made to check whether the machine can transplanter the rice according ...

A field plot experiment was conducted on two types of paddy soils in the Taihu Lake Region of China from June 2000 through 2002 to assess phosphorus (P) losses by runoff and drainage flow and the effectiveness of rice–wheat double cropping on reducing P losses from paddy soils. Commercial NPK compound fertilizer and single superphosphate fertilizer were applied to furnish 0, 30, 150, and 300 kg P ...

The fertilization management of the rice crop in Piedmont was analyzed at a regional scale, and the agronomic and environmental sustainability of the actual fertilization strategy of rice was evaluated through the analysis of its effect on the soils and waters quality. On average, a total amount of 127 kg ha − 1 of N, 67 kg ha − 1 of P 2 O 5 and 161 kg ha − 1 of K 2 O were ...

Rice paddy soils undergo several cycles of drying and wetting during a growing season. A laboratory study was conducted to determine the effect of soil moisture conditions on the distribution and kinetics of extractable and bound residues of 14C-metsulfuron-methyl in six Chinese paddy soils during 84 d of incubation at 15°C with moisture contents varying from 20 to 50% of the field water-holding ...

Residue analysis of trifloxystrobin and its metabolite (CGA 321113) in rice matrices, paddy water, and soil was developed using the quick, easy, cheap, effective, rugged, and safe (QuEChERS) method and high performance liquid chromatography tandem mass spectrometry (HPLC‐MS/MS). The method was used to evaluate the dissipation rate of trifloxystrobin and CGA 321113 in rice seedling, soil, and ...

In the Albufera (València) region of Spain, rice has been farmed for nearly 500 years. Post-harvest flooding of rice fields has become an integral element of wetland refuge for migratory birds. The steady rise in the cost of purchased inputs is causing considerable economic stress to the viability of rice farming in this region. In 2011, it has been estimated the cost of purchased diesel ...

We can precisely predict the future dynamics of populations only if we know the underlying mechanism of population dynamics. Long-term data are important for the elucidation of such mechanisms. In this article we analyze the 50-year dynamics of annual light-trap catches of three insect pest species living in paddy fields in Japan: the rice stem borer, Chilo suppressalis (Walker) (Lepidoptera: ...